Overview Of Communications Methods; Introduction - Omron E5CN Manual

SECTION 1 Communications Methods

1.1 Overview of Communications Methods

■ Introduction

1-2
The program for the communications functions are created on the host
computer, and the E5CN's parameters are monitored or set from the host
computer. Therefore, the description provided here is from the viewpoint of the
host computer.
CompoWay/F is OMRON's standard communications format for general serial
communications. This format uses a standard frame format as well as the
well-established FINS* commands used for OMRON's PLCs. Therefore, it can
simplify communications between components and the host computer.
*FINS (Factory Interface Network service)
The FINS protocol provides message communications between controllers in
OMRON FA networks.
Modbus is a standard communications control method that conforms to the
Modicon Company's RTU-mode Modbus Protocol (PI-MBUS-300 Revision J).
Supports functions equivalent to the CompoWay/F Read Variable Area, Write
Variable Area, Operation Command, and Echoback Test functions.
The E5CN supports the following communications functions.
• Reading/writing of parameters
• Operation instructions
• Selection of setup levels
Communications are subject to the following condition:
• Parameters can be written only when the "communications writing" parameter
is set to ON (enabled).